Lab 5 - Qualitative Analysis

Place 5 drops of the cation solution in the

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Unformatted text preview: +, Hg22+ or Pb2+. Place 5 drops of the cation solution in the appropriately labeled tube. 3 Place a small, clean stirring rod in each tube. Add three drops of 3 M HCl to each solution and stir. Record your observations in Data Table B (solid? color? etc.). 4 Perform a confirmatory test for any solution in step 3 for which a solid does not form. Confirmatory Test: Add 5 drops of 0.2 M KI to the test tube. Enter your observations in Data Table A. The contents of this test tube may be discarded into the waste. If a solid does form in step 3, do not perform a confirmatory test. Enter N/A in Data Table A for the solution from HCl and continue to the next step. 5 In cases where a precipitate formed in step 3, isolate the solid by centrifuging and decanting the supernatant liquid. The supernatant may be discarded into the waste in this test. Wash the precipitate (to remove any remaining HCl) by adding 10 drops of deionized water and mixing with a stirring rod. Be sure to break up any clumps of solid that are present. Centrifuge the sample and decant the supernatant liquid. This "washing liquid" may be discarded into the waste. Sol ubi l i t y i n Hot Wat er 6 Add 10 drops of deionized water to the washed solids from step 5 and place the tubes in the boiling water bath for several minutes, stirring frequently with a clean stirring rod. Record your observations in Data Table B (color change? redissolve? etc.). 7 Perform a confirmatory test for any solution in step 6 for which solid dissolves. Confirmatory Test: Add 5 drops of 0.2 M KI to the test tube. Enter your observations in Data Table A. The contents of this test tube may be discarded into the waste. If a solid does remain in step 6, do not perform a confirmatory test. Enter N/A in Data Table A for the solution from hot water and continue to the next step. 8 For the samples from step 6 where a precipitate remains, isolate the solid by centrifuging and decanting the supernatant liquid. The supernatant may be discarded i...
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This document was uploaded on 01/22/2014.

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